To determine the size of the deep cycle battery needed to run a Cooluli Classic mini fridge, you'll need to consider the power consumption of the fridge and the desired runtime without recharging the battery. Here's how you can calculate it:
Check the power consumption: Find the power rating of the Cooluli Classic mini fridge. This information is usually provided on the fridge's label or in the user manual. Look for the power rating in watts (W) or amps (A).
Calculate the daily energy consumption: Once you have the power rating, calculate the daily energy consumption by multiplying the power rating by the number of hours the fridge will run each day. For example, if the fridge consumes 50 watts and runs for 24 hours, the daily energy consumption would be 50 watts x 24 hours = 1200 watt-hours (Wh) per day.
Determine the desired runtime: Decide how many days you want the battery to power the fridge without recharging. Let's say you want the fridge to run for two days without recharging.
Consider battery efficiency: To account for energy loss during the charging and discharging process, it's a good idea to add a buffer of around 10-20% to the total energy consumption.
Calculate the required battery capacity: Multiply the daily energy consumption (including the buffer) by the desired runtime. Using the example above, with 20% buffer, the total energy requirement for two days would be 1200 Wh/day x 2 days x 1.2 (20% buffer) = 2880 watt-hours (Wh).
Battery capacity: Now, you need to choose a deep cycle battery with a capacity equal to or greater than the calculated energy requirement. Deep cycle batteries are typically rated in ampere-hours (Ah) at a specific voltage (often 12V for portable applications). To convert watt-hours (Wh) to ampere-hours (Ah) at 12V, use the formula: Ah = Wh / Volts. For example, for 2880 Wh at 12V, you'd need a battery with a capacity of approximately 240 Ah (2880 Wh / 12V = 240 Ah).
Remember that actual performance may vary depending on factors like ambient temperature, battery age, and the efficiency of the fridge. It's always a good idea to have some extra capacity in the battery to ensure reliable operation. Additionally, consider using a deep cycle battery with a built-in battery management system (BMS) to protect the battery from overcharging and over-discharging, which can extend its lifespan and ensure safe usage.